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1887

access icon free Differential current-based fault protection with adaptive threshold for multiple PV-based DC microgrid

© The Institution of Engineering and Technology
Received 14/06/2016, Accepted 08/02/2017, Revised 23/12/2016, Published 13/02/2017

A new differential current-based fast fault detection and accurate fault distance calculation is proposed for photovoltaic (PV)-based DC microgrid. A multiterminal direct current (MTDC) distribution network is studied as an adequate solution for present low-voltage utility grid scenario, where local distributed generators (DGs) are incorporated primarily by power electronics based DC–DC converters, DC–AC voltage-source converters (VSCs). PV and diesel generator (as auxiliary source) are considered for cascaded common DC bus, and AC utility bus integration is achieved by VSC unit for the proposed MTDC network. DC microgrid protection is quite significant research focus due to the absence of well-defined standards. Pole-to-pole, pole-to-ground, PV-side DC series and ground arc faults are basically considered as DC distribution network hazards. A discrete model differential current solution is considered to detect, classify and locate the faults by modified cumulative sum average approach. A comprehensive case study is presented with different DC loadings, to deliberate effectiveness of the proposed protection scheme in terms of percentage error and trip time (Ts). The result verification is conducted in MATLAB environment as well as TMS320C6713 digital signal processor-based test bench with the proposed multiple DGs based DC microgrid.

Inspec keywords: power generation protection; voltage-source convertors; distributed power generation; DC-AC power convertors; power distribution protection; DC-DC power convertors

Other keywords: adaptive threshold; multiterminal direct current distribution network; ground arc faults; discrete model differential current solution; diesel generator; differential current-based fault protection; pole-to-ground DC series; DC-AC voltage-source converters; modified cumulative sum average approach; photovoltaic generator; local distributed generators; pole-to-pole DC series; TMS320C6713 digital signal processor; Matlab environment; multiple photovoltaic-based DC microgrid; cascaded common DC bus; AC utility bus integration; DC-DC converters; low-voltage utility grid; PV-side DC series; DC microgrid protection; MTDC distribution network; fault distance calculation; DC distribution network hazards

Subjects: Distribution networks; Power system protection; Distributed power generation; Power electronics, supply and supervisory circuits; DC-AC power convertors (invertors); DC-DC power convertors

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